What oil does a 1987 Chevrolet Blazer 6.2L Diesel take?
For the 1987 Chevrolet Blazer with the 6.2L 8-cylinder diesel engine (Engine Code C), the recommended oil viscosity is SAE 5W-30, which is preferred for all temperatures. The engine oil capacity is 7 quarts when performing a service with a filter replacement. AMSOIL recommends using Signature Series 5W-30 100% Synthetic Max-Duty Diesel Oil (DHDQT-EA) for optimal protection.
AMSOIL product recommendations
Based on the vehicle specifications, the following AMSOIL products are recommended for your maintenance needs:
Engine Oil & Filter
| Product Name | Part Code |
|---|---|
| Signature Series 5W-30 Max-Duty Diesel Oil | DHDQT-EA |
| AMSOIL Oil Filter | EAO24-EA |
| WIX Oil Filter | 51061-EA |
Coolant & Transmission
| Product Name | Part Code |
|---|---|
| Passenger Car & Light Truck Antifreeze | ANTPC1G-EA |
| Propylene Glycol Antifreeze | ANT1G-EA |
| Signature Series Synthetic ATF | ATLPK-EA |
| OE Fuel-Efficient Synthetic ATF | OTLQT-EA |
Engine Oil Specifications & Details
Proper lubrication is critical for the longevity of the 6.2L diesel engine. Below are the confirmed specifications from the AMSOIL lookup data.
Oil Viscosity Options
| Condition | Viscosity |
|---|---|
| Above -18°C | 10W-30 |
| Above 4°C | 30 |
| All Temperatures | 5W-30 (Preferred) |
Oil Capacity & Grade
| Detail | Specification |
|---|---|
| Capacity (with filter) | 7 quarts |
| Oil Grade | CF-4 |
Note: Always check the oil level after refilling.
Transmission Fluid Specifications
The 1987 Chevrolet Blazer utilizes different transmission configurations. Note that manufacturer technical service bulletins have updated the specification from Dexron II or III to Dexron VI for these applications.
THM700-R4 (4-Speed)
| Type | Capacity |
|---|---|
| Total Fill | 11.5 quarts |
| Initial Fill | 5 quarts |
THM400 (3-Speed)
| Type | Capacity |
|---|---|
| Total Fill | 10.6 quarts |
| Initial Fill | 4.3 quarts |
Coolant Specifications
The cooling system requires a capacity of 25 quarts. AMSOIL offers both pre-mix and concentrated options.
- AMSOIL Passenger Car & Light Truck Antifreeze: Ethylene glycol 50/50 pre-mix formulation.
- AMSOIL Propylene Glycol Antifreeze: Concentrated – requires mixing with distilled or high-quality water.
Common diesel oil-related concerns and how AMSOIL products may help
| Concern | Why it matters | AMSOIL product from this lookup | How it may help | Important limitation |
|---|---|---|---|---|
| Engine Wear | Diesel engines face high pressure and friction. | DHDQT-EA | Delivers 6X more wear protection based on Detroit Diesel testing. | Requires proper oil change intervals. |
| Contaminants | Small particles can cause abrasive wear. | EAO24-EA | Provides 99% filtering efficiency at 20 microns. | Filter must be replaced regularly. |
| Extreme Temperatures | Viscosity changes can affect lubrication. | DHDQT-EA | Excels in extreme temperatures and maintains proper thickness. | Not a substitute for mechanical repair. |
Diesel maintenance notes for this vehicle
When maintaining a vintage 6.2L diesel, focus on the following:
- Oil Level: Always check the oil level after refilling to ensure accuracy.
- Filter Efficiency: Using high-efficiency filters like the AMSOIL EAO24-EA can help reduce engine wear by capturing small, wear-causing contaminants.
- Coolant Compatibility: If using concentrated antifreeze, ensure you mix it with distilled or high-quality water as required.
Recall, TSB, and manufacturer communication notes
NHTSA research indicates the following for the 1987 Chevrolet Blazer:
- Exterior Lighting: A recall was noted regarding certain replacement lamps that may fail to conform to federal safety standards (Campaign 06E026000).
- Fuel System: A recall regarding replacement fuel filters where the O-ring might not seat correctly, potentially causing leaks (Campaign 06E043000).
- Oil Filters: A recall was issued for certain FRAM Racing HP4 and HP8 oil filters due to gasket pliability under high temperatures (Campaign 07E088000).
Disclaimer: Always verify open recalls by using your specific VIN through official manufacturer or NHTSA channels.
About this vehicle
The 1987 Chevrolet Blazer represents a significant era in General Motors’ SUV history. Depending on the specific chassis, this model may belong to the full-size K5 Blazer lineage (a variant of the C/K pickup chassis) or the compact S-10 Blazer platform. This particular vehicle is equipped with the 6.2L 8-cylinder diesel engine, a notable component of GM’s historical diesel offerings.
It is important for owners to distinguish this vintage 6.2L engine from modern Duramax engines. The 6.2L belongs to an earlier generation of GM diesel technology; therefore, maintenance requirements such as cooling systems, fuel injection components, and glow plug configurations differ significantly from modern common-rail diesel engines. Owners should avoid applying modern Duramax fluid specifications to this 1987 engine.
Typical use cases for vehicles of this era often include utility work, light towing, or off-road recreation. Maintenance focus for these vintage diesels generally centers on fuel system integrity, preventing air in the lines, and maintaining robust electrical systems to ensure reliable cold starts.
Common questions about this vehicle’s diesel oil and maintenance
What is the preferred oil viscosity for my 1987 Blazer 6.2L?
The AMSOIL lookup prefers SAE 5W-30 for all temperatures, though 10W-30 is also listed for temperatures above -18°C.
How much oil does the 6.2L diesel engine hold?
The capacity is 7 quarts when including a filter change. Always check the level after refilling.
Can I use Dexron III in my automatic transmission?
The AMSOIL lookup notes that for the THM700-R4 and THM400, the specification has been updated from Dexron II or III to Dexron VI per a manufacturer Technical Service Bulletin.
What is the capacity of my cooling system?
The cooling system capacity is 25 quarts.
Does AMSOIL offer a high-efficiency oil filter for this engine?
Yes, the AMSOIL Oil Filter (EAO24-EA) provides 99% filtering efficiency at 20 microns.
How often should I change my diesel oil?
While specific intervals depend on usage, AMSOIL Signature Series products are designed to confidently extend drain intervals.
Verification Disclaimer: All information is derived from provided source data. Please verify all maintenance specifications against your vehicle’s owner’s manual or a certified professional before performing service.